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RE: RSS/HDT Sec - Different Query Plans???

Posted By: Mueller, Daniel D.
Date: Thursday, 9 July 2015, at 11:16 a.m.

In Response To: RE: RSS/HDT Sec - Different Query Plans??? (Madison Pruet)

Thanx Short timer,

I am going to forward your comments to the PMR owner.


-----Original Message-----
From: [] On Behalf Of Madison Pruet
Sent: Thursday, July 09, 2015 10:24 AM
Subject: RE: RSS/HDT Sec - Different Query Plans??? [35425]

I suspect that the dictionary cache on the secondary is not being invalidated as the update stats are being performed and am guessing that you are doing automatic update stats.

The secondary has to know what needs to be invalidated as the statistics are replicated. If we don't know that they have been updated, then the old dictionary cache will remain intact.

I'd look at it, but then again, I'm a bit of a short-timer now.


From: "Mueller, Daniel D." <>
Date: 07/09/2015 09:07 AM
Subject: RE: RSS/HDT Sec - Different Query Plans??? [35424] Sent by:

I appreciate all of the replies from everyone but my thought is that both servers were bounced during the swap process to resolve dbserveralias differences. That was 1.5 weeks ago. That would have emptied all buffers.
should not act differently should they? As for optimizer hints, why should that be be necessary if the servers are replicated from the same primary?

To add to this, I am noticing a lot more temp dbspaces usage so I suspect there are different query plans in other places as well.

I have compared onconfigs again and see nothing that would make a difference.
I have tested outside the app so no client side diffs there.

I have thought about whacking the hdr sec and restoring it again but I have no proof this will do any good and it is a big todo here. I cannot go on a guess there. I think something else is wrong. I have opened a PMR so IBM is looking at it.

Thanx again,

-----Original Message-----
From: [] On Behalf Of Art Kagel
Sent: Thursday, July 09, 2015 9:39 AM
Subject: Re: RSS/HDT Sec - Different Query Plans??? [35420]

One thing you could try is to adjust the OPT=5FSEEK=5FFACTOR parameter in t= he ONCONFIG file. This is an undocumented parameter that controls the new (in
11.70+) cost factor applied to index accesses when the costs are calculated.
The range is zero to 25 and the default is 6. Before this change the equivalent factor was zero. So, you might try setting this to zero.
OPT=5FSEEK=5FFACTOR is supported by onmode -wm/wf so you can make the change dynamically.

I know that this has nothing to do with the different query plans between the different servers which I think is more due to stale distributions in memory on one server or the other as Fernando noted, but I also don't like the fact that both query plans are using hash joins and this is one way to adjust that behavior.


Art S. Kagel, President and Principal Consultant ASK Database Management


Disclaimer: Please keep in mind that my own opinions are my own opinions and do not reflect on the IIUG, nor any other organization with which I am associated either explicitly, implicitly, or by inference. Neither do those

opinions reflect those of other individuals affiliated with any entity with

which I am affiliated nor those of the entities themselves.

On Thu, Jul 9, 2015 at 7:24 AM, BENJAMIN THOMPSON <> wrote:

> I would be most concerned by the RSS plan as it has higher costs than
> the HDR one and you would therefore expect it not to be the one
> chosen.
> Can you force the HDR plan on the RSS machine by using hints like
> +ORDERED or similar? If you can this would at least show that all the
> indices needed for it are available.
> Neither plan uses the index on which
> you say is indexed. Art has already pointed this out, however. With
> OPTCOMPIND=3D0 I would expect it to be used regardless of the state of
> the distribution on the column but with 1 (and not with repeatable
> read isolation) or 2, it will be purely costs based. Unless you don't
> have much reservation history I think it would be advantageous to use
> this.
> Indexing would help here too.
> Having said all this I suspect the different plans may be a bug.


> Forum Note: Use "Reply" to post a response in the discussion forum.



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